twoxtwo_action Class Reference

Detect interesting 2 by 2 blocks. More...

#include <CoinPresolveDupcol.hpp>

Inheritance diagram for twoxtwo_action:

Collaboration diagram for twoxtwo_action:

List of all members.

Classes
struct	action
Public Member Functions
const char *	name () const
	A name for debug printing.
void	postsolve (CoinPostsolveMatrix *prob) const
	Apply the postsolve transformation for this particular presolve action.
	~twoxtwo_action ()
Static Public Member Functions
static const CoinPresolveAction *	presolve (CoinPresolveMatrix *prob, const CoinPresolveAction *next)

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Detailed Description

Detect interesting 2 by 2 blocks.

If a variable has two entries and for each row there are only two entries with same other variable then we can get rid of one constraint and modify costs.

This is a work in progress - I need more examples

Definition at line 163 of file CoinPresolveDupcol.hpp.

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Constructor & Destructor Documentation

twoxtwo_action::~twoxtwo_action

(

)

[inline]

Definition at line 194 of file CoinPresolveDupcol.hpp.

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Member Function Documentation

const char* twoxtwo_action::name

(

)

const [virtual]

A name for debug printing.

It is expected that the name is not stored in the transform itself.

Implements CoinPresolveAction.

static const CoinPresolveAction* twoxtwo_action::presolve	(	CoinPresolveMatrix *	prob,
		const CoinPresolveAction *	next
	)		[static]

void twoxtwo_action::postsolve

(

CoinPostsolveMatrix *

prob

)

const [virtual]

Apply the postsolve transformation for this particular presolve action.

Implements CoinPresolveAction.

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The documentation for this class was generated from the following file:

• src/CoinPresolveDupcol.hpp